68919899 has 2 divisors, whose sum is σ = 68919900. Its totient is φ = 68919898.

The previous prime is 68919889. The next prime is 68919901. The reversal of 68919899 is 99891986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68919899 is a prime.

Together with 68919901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68919889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34459949 + 34459950.

It is an arithmetic number, because the mean of its divisors is an integer number (34459950).

Almost surely, 2^68919899 is an apocalyptic number.

68919899 is a deficient number, since it is larger than the sum of its proper divisors (1).

68919899 is an equidigital number, since it uses as much as digits as its factorization.

68919899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 59.

The square root of 68919899 is about 8301.8009491917. The cubic root of 68919899 is about 409.9978167641.

The spelling of 68919899 in words is "sixty-eight million, nine hundred nineteen thousand, eight hundred ninety-nine".